Improvement in file-blank holders for grinding



J. GARLAND.

FILE-BLANK HOLDER FOR GRINDING.

No. 171,277. Patented Dec. 21, 1875.

INVENTOK N.PETERS, PHOTO LITHOGRAFHEE WASHINGTON. D C.

UNITED. STATES PATENT 0rFIcE JAMES GARLAND, OF CENTRAL FALLS, RHODE ISLAND.

IMPROVEMENT IN FILE-BLANK HOLDQERS FOR GRINDING.

Specification forming part of Letters Patent No. 171,277, dated December 21, 1875; application filed November 6, 1875.

To all whom it may concern.-

Be it known that I, JAMES GARLAND, of Central Falls, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in File-Blank Holders for Grinding; and lhereby' declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification This invention has reference to a class of tools or apparatus used for holding a number of file-blanks while the same are operated upon by a grindstone or other grinding device; and consist-s, first, in the peculiar arrangement of springs, by which each tile-blank is held against the grinding-surface, with a given pressure independent of all the other blanks second, in the novel arrangement by which the springs can be adjusted, so as to exertthe pressure required and place the different file-blanks on an even line; third, in the novel manner in which the shank of the fileblank is secured, which, while it firmly holds the file-blank, allows the same to be readily turned over, and also holds the same firmly to resist the thrust of the grinder.

Figure 1 is a perspective view of my improved file-blank holder. Fig. 2 is an enlarged side view of a portion of the same.

Similar lettersof reference indicate corresponding parts.

In the drawings, a a a represent three sawfile blanks. Any other kind offile-blanks and any number required may, however, be secured in a holder in all essential respects like the one represented in the drawings. b b are steel springs, provided with suitable recesses at the turned-up end to receive the end of the file-blank, and hold the same firmly in line, and still allow the file-blank to rock and freely adjust itself to the surface ofthe grinder. c c a .are steel springs, in the turned-up ends of which the shank of the file-blank rests, allowing the blank to rock freely and adjust itself so as to bring the face of the same fairly against the grinder. Secured to the springs 0'0 0 are the abutments 0 0, against which the end of the file-blank rests, so that the resistance against the action of the grinder can not displace the file-blank. d d d are the holder-springs, secured to the springs c o c The springs may, therefore, be adjusted by the screws ff, which, by pressing on the springs on the center of the bolster, raise the ends of the springs Where the file-blank is supported.

In the drawings three file-blanks are shown supported by the holder; but, in practice, a holder for a greater number is used.

The operation of the file-blank holder is as follows The holder, as shown and described, is placed in a vertical or nearly vertical position. A boy now takes the tiles, and, placing the point of the shank in the hook or eye of the spring d, draws this forward, and then pushes the point of the shank against the abutment 0. At the same time he places the upper end of the tile-blank into the recess on the turned-up end of the spring I). The fileblanks are now held sufficiently firm by the springs d d to be handled and placed against th( grindstone or other grinding device without being displaced.

The tile-blanks can adjust themselves freely to the surface of the grinder. Being free to rock, and supported at each end by a separate spring, they will adjust themselves to the surface of the grinder, as any excess of pressure will cause the spring or springs to yield. When, in place of supporting the file-blanks on springs, each end yielding independent of the other, and each file-blank independent of the other, the file-blanks are bedded in some elastic material, such as india rubber, the pressure on one tile-blank in excess of the others will cause the first to yield, but not as in my holder, for any excess of pressure on such material causes the same to yield in one direction, while at all other points the material is raised. If a number of file-blanks are supported on a rubber bed, excessive pressure on one will raise the others.

claim as new, and desire to secure by Letters Patent- 1. The combination of the spring d for holding the file-blank,'with an elastic support for a new the file-blank, substantially as and for the purpose deseribed.

2. The combination of the springs b b and the springs c c, with the springs d d,'substantially as and for the purpose specified.

3. The combination, with the springsb b and springs c c, of the bolsters E E, provided with the screws f f and raised bearing-surfaces, as and for the purpose described.

JAMES GARLAND.

Witnesses:

J OSEPH A. MILLER, HORACE F. HORTON. 

